US 11,787,901 B2
Polyester container and manufacturing method therefor
Yoo Jin Lee, Gyeonggi-do (KR); Sung-Gi Kim, Gyeonggi-do (KR); and Boo-Youn Lee, Gyeonggi-do (KR)
Assigned to SK Chemicals Co., Ltd., Gyeonggi-do (KR)
Filed by SK CHEMICALS CO., LTD., Gyeonggi-do (KR)
Filed on Aug. 5, 2022, as Appl. No. 17/881,946.
Application 17/881,946 is a division of application No. 16/624,148, granted, now 11,492,444, previously published as PCT/KR2018/006858, filed on Jun. 18, 2018.
Claims priority of application No. 10-2017-0079381 (KR), filed on Jun. 22, 2017.
Prior Publication US 2022/0380595 A1, Dec. 1, 2022
Int. Cl. C08L 67/02 (2006.01); C08G 63/183 (2006.01); C08G 63/672 (2006.01); C08G 63/86 (2006.01); B29C 49/00 (2006.01); C08G 63/80 (2006.01); B29K 67/00 (2006.01); B29L 31/00 (2006.01)
CPC C08G 63/183 (2013.01) [B29C 49/0005 (2013.01); C08G 63/672 (2013.01); C08G 63/80 (2013.01); C08G 63/863 (2013.01); C08L 67/02 (2013.01); B29K 2067/003 (2013.01); B29L 2031/7158 (2013.01); C08G 2390/00 (2013.01); C08L 2201/10 (2013.01); C08L 2203/10 (2013.01)] 7 Claims
 
1. A method of preparing a polyester container comprising the steps of:
(a) carrying out an esterification reaction or a transesterification reaction of (i) a dicarboxylic acid or a derivative thereof including terephthalic acid or a derivative thereof and (ii) a diol including 6.5 mol to 25 mol of isosorbide and 80 mol to 200 mol of ethylene glycol based on 100 mol of the total dicarboxylic acid or the derivative thereof;
b) subjecting the esterification or transesterification reaction product to a polycondensation reaction so that an intrinsic viscosity, which is measured at 35° C. after dissolving the reaction product in orthochlorophenol at a concentration of 1.2 g/dl at 150° C. for 15 minutes, reaches 0.60 dl/g to 0.75 dl/g, thereby providing a polyester resin;
(c) crystallizing the polyester resin;
(d) subjecting the crystallized polymer to a solid phase polymerization such that the intrinsic viscosity, which is measured at 35° C. after dissolving the polymer in orthochlorophenol at a concentration of 1.2 g/dl at 150° C. for 15 minutes, reaches a value of 0.25 dl/g to 0.40 dl/g higher than the intrinsic viscosity of the resin obtained in step (b); and
(e) molding a polyester container from the polyester resin,
wherein the intrinsic viscosity of the resin obtained in step (d) is 0.85 dl/g to 1.0 dl/g, and
wherein the polyester resin includes 6 mol % to 12 mol % of a diol moiety derived from isosorbide based on the total diol moieties derived from the diol.